To change the call-forwarding number that is connected to your Respond Flow account, you simply go to your account settings and update the number listed under your "User Details" and click "Save". Future calls will go to the new number.
You can find your account settings page by clicking your name at the top right hand corner and selecting "Account Settings".
Then under "User Detail" edit your phone number on file and click "Save Changes".
Now you should be set to receive all future calls to the new number selected.
Please let us know if you have any questions or concerns.